What should you do in this kind of visibility?

Your answer is correct because reducing speed and keeping towards the right-hand edge of the carriageway are important safety measures in conditions with limited visibility, such as when you are approaching a hill crest with oncoming glare from the sun or headlights.

Reducing your speed gives you more time to react to unexpected hazards that may appear suddenly, especially when visibility is compromised. Keeping to the right ensures you maintain a safe position on the road, helping to avoid collisions with oncoming traffic.

Switching on your main beam lights (answer 3) is not advisable in this situation because it can blind oncoming drivers, reducing safety for everyone.

In summary, German traffic rules emphasize careful driving and proper lane positioning under low visibility conditions to increase safety.